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<pre class="textdiagram" id="fig15">
       +---------+
       |         |
       |  Node   |
       |         |
       +---------+
       | Socket  |
       \----+----/
            |
            |
     +------+------+
     |             |
     |             |
/----+----\   /----+----\
| Socket  |   | Socket  |
+---------+   +---------+
|         |   |         |
|  Node   |   |  Node   |
|         |   |         |
+---------+   +---------+
</pre>
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